Explanation:
Although the word “voice” refers most directly to the sounds made by the use of the human vocal tract, it also has metaphoric meaning.
Musicians refer to the “voice” of various musical instruments, the distinctive sounds made by each one, even when different instruments are playing the same note. This is in reference to the tonal quality imparted by the shape and construction of each instrument. One clarinet, for example, might have a richer or a harsher voice than another one. In this context, the word “sound” is pretty much interchangeable with “voice”, but “sound” is more generic, while “voice” conveys the idea a little more specifically.
“Voice” can also have a political/social meaning, referring to individual or collective ability to effect change. It is observable that people of lower social status must struggle to be heard in the political arena. When they succeed, it is often said that they have “found their voice”.
